Towards two-dimensional color tunability of all-solid-state electrochromic devices using carbon dots

Abstract

Electrochromic devices (ECDs) that display multicolor patterns have gradually attracted widespread attention. Considering the complexity in the integration of various electrochromic materials and multi-electrode configurations, the design of multicolor patterned ECDs based on simple approaches is still a big challenge. Herein, it is demonstrated vivid ECDs with broadened color hues via introducing carbon dots (CDs) into the ion electrolyte layer. Benefiting from the synergistic effect of electrodes and electrolytes, the resultant ECDs presented a rich color change. Significantly, the fabricated ECDs can still maintain a stable and reversible color change even in high temperature environments where operating temperatures are constantly changing from RT to 70°C. These findings represent a novel strategy for fabricating multicolor electrochromic displays and are expected to advance the development of intelligent and portable electronics.

Temperature Sensors Integrated with an Electrochromic Readout toward Visual Detection

“…As can be seen, the color of the ECD with various systems could be synthetically tuned to produce a large family of multicolor states during potentiostatic charge/discharge cycling. Moreover, in previous work, we found that adding the carbon dots (CDs) into the electrolyte layer of the ECD can also greatly enrich the color of the ECD Figure b displays the optical images of ECDs (PB-WO 3 system) containing different CDs.…”

“…Moreover, in previous work, we found that adding the carbon dots (CDs) into the electrolyte layer of the ECD can also greatly enrich the color of the ECD. 45 Figure 5b displays the optical images of ECDs (PB-WO 3 system) containing different CDs. Obviously, with the increase of CDs, the color gradually changes from light yellow to orange red at the voltage of −1 V. When the mass of CDs decreased, the color of the ECD can change from blue to blackish green and deepen as the CDs decreased.…”

Multicolored inorganic electrochromic materials: status, challenge, and prospects

“…An ECD was successfully fabricated by employing MnO 2 and PB as complementary electrodes and meanwhile introducing CDs into the electrolyte layers. 125 The device initially appeared orange-red at 0 V, but with increasing voltage, its color transitioned gradually from orange-red to orange, light yellow, yellow, green, and finally to dark green (Fig. 17a).…”

2D-Layered Structure WS2 Nanosheets with Improved Electrochromism for Organic-Based Device

“…In the devices, electrochromic materials are the core components, and their reversible optical properties can be achieved via regulating voltages. [13][14][15][16] Various organics (conducting polymers), 11,17,18 inorganics (metal oxides), [19][20][21] organometallic compounds 22 have been proficiently used for electrochromic materials, but the tendency to develop new electrochromic materials is still fierce. One of the important reasons to explore new materials is that the properties of current solid-state ECDs are severely limited.…”